I resent being lumped into a category of Afghan-hating ignorant people because I am a white American.
I very much agree with this. I have also found that you can substitute any other ethnic or racial group for "Afghan-hating" in that quote.

I SO resent people assuming I am racist or a bigot or narrow-minded or uninformed or ignorant simply because I am a caucasian, and an American.

Prejudice is prejudice ... no matter who does the "pre-judging". That's what prejudice is, after all, pre-judging someone on their outward appearance, without taking the time to learn about the actual thoughts, knowledge, feelings or values of that person. The knife cuts both ways, and it hurts just the same.